The Ion Trinity Core Semidry 4/3 FZ Womens Wetsuit 2019 Womens Wetsuit from Oceansource is the TRINITY AMP's little sister, the TRINITY CORE provides great stretch and good all-round capabilities. Featuring a front zip with an easy entry, the strong nylon used in the legs and torso makes this suit incredibly tough and durable. Comfortable to wear, this line provides superb stretch in the arms and around the calves.